Tractor trailer
FIG. 1 is a perspective view of a tractor trailer showing our new design; 
     FIG. 2 is an enlarged front elevation view thereof; 
     FIG. 3 is an enlarged rear elevation view thereof; 
     FIG. 4 is a bottom plan view thereof; 
     FIG. 5 is a bottom plan view thereof; 
     FIG. 6 is a left side elevation view thereof; and 
     FIG. 7 is a right side elevation view thereof.